Abstract: The present invention proposed a weighted Centroid Localisation (WCL) algorithm, which does the location estimation based on the known positions of the gateways and the measurements times of arrival (TOA) at the gateways. The algorithm computes the weight of the gateway based on their rank when the gateways are sorted by their TOA. Simulations have demonstrated the algorithm's robustness under different multipath/fading channel conditions and its good location performance.

Abstract: The present invention proposed a weighted Centroid Localisation (WCL) algorithm, which does the location estimation based only on the known positions of the gateways and the measurements of the Received Signal Strength Indication (RSSI) at the gateways. The algorithm computes the weight of the gateway based on their rank when the gateways are sorted by their relative RSSI. Simulations have demonstrated the algorithm's robustness under different multipath/fading channel conditions and its good location performance.

Abstract: A system comprising at least a mobile device (110) and a plurality of gateways (120a-120g) whose positions are known, wherein the gateways (120a-120g) are operatively arranged to determine for each gateway a time differences of arrival (TDOA) of a signal originated by the mobile device (110). A solver unit (160) computes the position of the mobile device (110), based on said time difference of arrival (TDOA). The solver unit (160) implements ELM and a LMS algorithm to compute the mobile device's one-shot location estimate based on one or several packet transmissions, and includes a procedure to decide if an LMS algorithm needs to be run and a procedure to select or combine the location output from ELM and LMS for the one-shot location output. Further the solver unit comprises a tracking algorithm to realise the tracking of the moving device or to improve location accuracy should the device static.

Abstract: The present invention proposed a weighted Centroid Localisation (WCL) algorithm, which does the location estimation based on the known positions of the gateways and the measurements times of arrival (TOA) at the gateways. The algorithm computes the weight of the gateway based on their rank when the gateways are sorted by their TOA. Simulations have demonstrated the algorithm's robustness under different multipath/fading channel conditions and its good location performance.

Abstract: The present invention proposed a weighted Centroid Localisation (WCL) algorithm, which does the location estimation based only on the known positions of the gateways and the measurements of the Received Signal Strength Indication (RSSI) at the gateways. The algorithm computes the weight of the gateway based on their rank when the gateways are sorted by their relative RSSI. Simulations have demonstrated the algorithm's robustness under different multipath/fading channel conditions and its good location performance.

Abstract: A system comprising at least a mobile device (110) and a plurality of gateways (120a-120g) whose positions are known, wherein the gateways (120a-120g) are operatively arranged to determine for each gateway a time differences of arrival (TDOA) of a signal originated by the mobile device (110). A solver unit (160) computes the position of the mobile device (110), based on said time difference of arrival (TDOA). The solver unit (160) implements ELM and a LMS algorithm to compute the mobile device's one-shot location estimate based on one or several packet transmissions, and includes a procedure to decide if an LMS algorithm needs to be run and a procedure to select or combine the location output from ELM and LMS for the one-shot location output. Further the solver unit comprises a tracking algorithm to realise the tracking of the moving device or to improve location accuracy should the device static.

Abstract: A system and method for synchronizing clocks across a packet-switched network eliminates wander accumulation to enable precision clock distribution across a large network. In addition to standard Precision Time Protocol (PTP) synchronization messages or similar time synchronization messages, each clock regenerator stage receives a grand clock error message from the previous stage, updates this error message with its own stage clock error, and then transmits the updated grand clock error to the next stage. This enables the synchronization algorithm to compensate for the error of the previous stage, effectively locking each clock regenerator stage to the grand master clock directly.

Abstract: A system and method for synchronizing clocks across a packet-switched network eliminates wander accumulation to enable precision clock distribution across a large network. In addition to standard Precision Time Protocol (PTP) synchronization messages or similar time synchronization messages, each clock regenerator stage receives a grand clock error message from the previous stage, updates this error message with its own stage clock error, and then transmits the updated grand clock error to the next stage. This enables the synchronization algorithm to compensate for the error of the previous stage, effectively locking each clock regenerator stage to the grand master clock directly.